Reply To: CDI teardown and repair
I decided today to further split open the plastic case of the unit. It’s unreparable anyway so it’s good to open up and explore the setup. Once I’d opened the casing and removed the rubberised compound a whole range of surface mounted components was exposed, 2 large thyristors which I think are for grounding the two ignition coils, a reasonable size micro-processor which probably control auto advance, dwell and other functions, and a large pickup signal conditioner to smooth out the pickup coil’s AC signal. Additionally a range of capacitors, resistors and transistors.. All in all, confirming that repairing this unit is not for me!!
It appears to be quite a complex two sided pcb with much more than just the basic requirements for a functioning TCI so with this in mind I am going to order the components I need to build my own unit with a programmable microcontroller for timing and dwell control.
It may take a while but I will update the post as I progress.